Improvement in ore-roasting furnaces



H. G. LIVERMORE. ORE noAsTING FURNACE.

Patented Nov. 9, 18'75.

rNa. 169,713.

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- Witnesses I1 entol vcf" 'UNITED STATES PATENT @Felon HORATIO G. LIVERMORE, OF SAN FRANCISCO, CALIFORNIA.

IMPROVEMENT IN ORE-ROASTING FURNACES.

Specification forming part of Letters Patent N0. 169,713, dated November 9, 1875; application tiled August 11, 1875.

To all whom it may concern:

' Be it known that I, HORATIO G. LIVER- MORE, of San Francisco city and count-y, State of California, have invented a Furnace for Roasting` Fine Ores; and I do hereby declare the following description and accompanying drawings are sufficient to enable any person skilled in the art or science to which it most nearly appertains to makek and use my said invention without further invention Lor experiment.

My invention relates to certain improvements in furnaces for roasting or desulphurizing tine ores; and it consists in a novel construction of a furnace having a door placed at such an angle that the ore, if left to itself, would slide to the bottom or foot. The space between this floor and the top or cover is comparativel y limited, and is crossed by numerous dams or abutments, so that the ore will be detained, and will only move when a portion is Withdrawn from below, when the whole body of ore will move downward, the dams serving to stir and turn the ore and loosen it, so that the vapors can escape and a new surface will be exposed to the heat. The furnace is situated at the foot of the incline, and the heat passes up over the body of ore, and is deected upon it.

Suitable feeding and stirring devices and passages for the escape of the fumes to the condensers are made. Y

Referring to the accompanying'drawing for a more complete explanation of my invention, Figure l is a longitudinal vertical section ofm y furnace. Fig. 2 is a transverse vertical section. parts of the furnace. Fin. 5 is a plan view of the channeled door and the abutments.

A is a furnace, which is built so that its floor stands at an incline of about fifty degrees from the base. This door may he made of any desired width-as ten or twelve feet-and is divided in the direction of its length into about as many longitudinal channels by partitions B. I then build transverse dams or abutments C, which extend across these channels about two inches from the inclined Hoor.

I have shown these dams as being in transverse section in the shape of a vertical parallelogram, having the upper corner cut 0E at Figs. 3 and 4t `are detached views of' such an angle that it will present aface nearly at right angles with the floor; but I do not desire to confine myself to this particular form, as it will be manifest that any form of abutment which will retain the body of ore at this angle, and allow it to move downward and be turned as it is removed from below, will ac-A complish the desired result.

The top or cover D of my furnace is placed at a short distance (twelve or fifteen inches) above the door, extending at the same angle and parallel with it, and this top has abutments E 'projecting downward at intervals, alternating with the dams C in such a manner that they will deflect the heat and flame upon the body of ore which is passing below. rlhe tire-place F is situated at the lowerend of the incline, and may have a hot-blast or other suitable draft. At the foot of the incline, and just above the fire-place, is a transverse passage, G, across the ore chamber, through 'which the ashes and burned dbris from the ore will pass to the waste-chamber H. This chamber is provided with a draw-hole and to allow the vapor to escape and present a new surface to the action of the heat.

't As this body of pulverized ore is but a few inches in thickness, it will be thoroughly and rapidly roasted.

The feeding device consists of a hopper, I, which stands on the upper end of the incline, fitting closely, and it is perforated with openings opposite to or above the upper end of each of the longitudinal channels, through which the ore passes as fast as the ore in the chamber moves downward. Openings J are made through the bottom, just behind and above the point where the ore enters lthe chamber7 and channels lc are also made in the sides near the same point, all leading to the chamber L beneath, and this chamber receives all the vapors of the roasted ore, and also the products of combustion. A tlue, M, leads to the condenser, and the vapor is drawn into the chamber and thence to the condenser by any suitable draft. The waste-chamber H has passages N formed on its walls, and these lead either directly to the chamber L, or they may be carried up above theroasting-chamber, and thence to their destination, their Object being to save any heat and mercurial vapors which may have passed into the Wastechamber H with the refuse Ore, and tO assist in drying the Ore in the pan o.

Openings may be made from the top of the furnace in a line with the inclined chamber, for the introduction Of rods to stir up the Ore, should it ever become clogged.

The Operation will then be as follows: The ore is tirst sii'ted with a coarse sieve, and the finer part is fed into the hopper after having been dried (if wet) upon a pan, o, which is set upon the top of' lthe furnace, above the replace and Ore-chamber, from which it will receive a gentle heat sufficient to dry out any moisture which may be contained within the ore. From the hopper the Ore will pass into the inclined chamber, sliding` down its floor, until it rests at the bottom, and the dams C will then retain it in its place, as before described.

lThe body ot' Ore, being` so thin and so thOr- Oughl) exposed to the heat, will be roasted almost as fast as it can be fed and withdrawn at the bottom, the operation being continuous.

Having thus described my invention, what I claim, and desire to secure by Letters Patent. is-' 1. The improvement in furnaces for roasting ores, consisting Ot' inclined chamber A, having a longitudinalliv-channeled Hoor and a roof with abutmeuts E, wherein the Ore may move downward by gravitation, and the heat and Haine pass upward and be deected on the ore, substantially as and for the purpose set forth.

2. rlhe shallow'furnace-chamber A, with its iloor standing at such an angle that the Ore will move down by gravitation alone, in combination with the transverse dams or abutments c, by which the ore is retained upon the licor-surface in a thin sheet, and is at the same time stirred as it moves downward, substantially as herein described.

3. The angular channels N, leading` from the waste-chamber H, above the inclined Orechamber, and thence tO the condenser, for the purpose of utilizing any heat and fumes which may have passed into the waste-chamber, substantially as described.

4. rlhe receiving-chamber L, for the fumes, having the openings J land K from the orechamber, and the channels` N from the wastechamber, substantially as herein described.

In witness whereof I hereunto set my hand and seal.

HORATI() G. LIVERMORE.

Witnesses:

GEO. H. STRONG, JNO. L. BOONE. 

